Both companies will make the announcement soon, a source familiar with the matter told DoNews on Saturday.

Qihoo CEO Zhou Hongyi also headed to the U.S. recently to hold "final negotiations" with Sohu's CFO Carol Yu but Sogou's CEO Wang Xiaochuan was not involved in the talks, the source said.

Rumors that Sogou has been courted by large Chinese technology companies Baidu, Tencent and Qihoo had been flying for several months. Wang however, had refuted rumors that Sogou will be acquired by Qihoo in a microblog post in May, a separate report by Want China Times reported.

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